[Richard Shaw]

This is probably way too late to help you out, but will hopefully be of use to someone else.

Obviously perfect lip sync can’t be magically done for you, but it doesn’t sound like that’s what you’re after.

I think you mean something along these lines:

https://www.youtube.com/watch?v=adc3MSS5Ydc

This can be done by converting the audio to keyframes (right click, keyframe assistant). This creates a new null (Audio Amplitude). Parent the mouth layer’s position to both channels and alter the expression slightly to something like this:

temp = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
value+[0, temp]/2

Adding “value” uses the layer’s original position. Use “+” or “-” to push the mouth down or up (down makes sense here, but up could be used to raise the eyebrows in time with the mouth, for example).

Changing the first “temp” to 0 prevents x axis (sideways) movement.

Dividing or multiply by the required amount will limit how far the mouth layer moves (here I’ve arbitrarily divided by 2 just as an example).

In a profile view of the character, the mouth layer’s rotation could be parented to the Audio Amplitude instead of position.

If the mouth is moving a bit too erratically, use the smoother (window, the smoother) on the Audio Amplitude layer. Click on “Slider” to select all keyframes, Choose a tolerance level (probably 2-4 or so) and hit apply. There will no-longer be a key on each frame and all keys will now be easy ease.

Hope this is helpful.

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